Antiseizing paste for sealing threaded joints and the like



Patented Jan. 29, 1946 ANT ISEIZING PASTE FOR SEALING THREADED JOINTS AND THE LIKE Arthur L. Parker,

Ohio, by Helen M. Heights, Ohio, ance Company, of Ohio deceased, late of Cleveland,

Parker, executrix, Shaker assignor Cleveland, Ohio, a corporation to The Parker -Appli- No Drawing. Original application October so,

.1943, Serial No.

Divided and this application May 10, 1945, Serial No. 593,095

4 Claims.

This invention relates to a pasty composition which is particularly adapted for employment in sealing threaded joints in metal parts, especially those formed in aluminum alloy, for preventing penetration of gasoline or oil and being capable of easy separation when so desired.

This application is a division of the applicant's co-pending application Serial No. 508,398 filed October 30, 1943. and correspondingly a continuation-in-part of said applicants prior application Serial No. 385,336 filed March'26, 1941.

A preferred composition is composed of the following ingredients:

Parts Highly oxidized and'polymerized blown castor oil Blown castor oil of lesser viscosity 1 Powdered zinc stearate 1 Alkyl ricinoleate 0.6

The blown castor oils provide a mixture having the desired viscosity in the final product. These castor oils have been blown so that they become polymerized and oxidized to a high degree whereby the properties are substantially fixed and do not alter during the course of time. By comparison, unpolymerized castor oil is approximately 30-35 percent soluble in gasoline, but this solubility steadily decreases in proportion as the oil is blown. The primary ingredient in the' above preferred composition is a highly blown castor oil which is insoluble in gasoline, has good adherence to aluminum or aluminum alloys in the presence of gasoline, and is a thick viscous material: the material known as "Hydronamic 351" has been found satisfactorygin practice. The less viscous blown castor oil has also been oxidized and polymerized to a condition to which it is substantially insoluble in gasoline but is of lesser viscosity and lesser freedom from oxidation than the primary highly blown castor oil; and it serves, by appropriate quantity of admixture, to produce a thinner product of semi-solid rather than solid nature. In this way, it facilitates -the spreading of the material during application, and also is effective to permit a quick release due to its anti-seize characteristics. Commercially available Hydronamic =4A has been found effective. f

The powdered zinc stearate is introduced to provide anti-seize properties in .the finished composition; and converts the product to the form of a semi-solid grease rather than that of a viscous liquid. Other Dloyed. but it has been found that zinc stearate aliphatic acids having,

is more satisfactory than other stearates. Calcium stearate may be used when care is taken to break up and distribute any hard particlesv that are formed and thereby reduce the composition to a smooth uniform paste. Zinc and calcium soaps of arachidic and higher aliphatic acids may be used. In general, it is preferred to employ zinc or calcium soaps of saturated straight-chain at least'l'l carbon atoms not including the carboxylic group.

In the parent application, of which this is a division, a light mineral oil is employed as a stabilizer: and claims therein are addressed to combinations containing such mineral oils: the alternative employment of neutral alkyl ricinoleates as described therein, is set out and claimed in this divisional case. This stabilizer serves to prevent any separation or formation of further products by way of oxidation or polymerization. It thus is effective to prevent continued polymerization of the oxidized and polymerized castor oils, so that the compound does not tend to become thicker upon aging in bulk or in place.

' tain the pro ortions of metallic-soaps may be em-" it does not require more The alkyl ricinoleate should be employed as a substitute for the mineral oil in corresponding proportion, care being taken that it is similarly neutral in behavior. In particular, the ester material selected should have such neutrality that than 0.05 m. g. of potassium hydroxide. or its equivalent in neutralizing sulfuric acid, for neutralizing one gram. Suitable ricinoleates are the methyl, ethyl, propyl, butgl, amyl, hexyl, methyl-acetyl, ethyl-acetyl, and the ethylene and diethylene glycol esters. Suitable alkyl ricinoleates therefore include the ricinoleic esters of aliphatic alcohols having up to six carbon atoms.

As a matter of practice, it is preferred to mainthe various ingredients within the following ranges: The quantity of the blown castor oil employed, figured on the basis of 4 parts of highly polymerized blown castor oil, includes the addition of from of the less-viscous blown castor oil in order to obtain the desired viscosity in the final product: or a quantity of 4 /2 to 6 parts of blown castor uniform consistency. The alkyl ricinoleate oper- /2 to 2 parts a heavy dough or paste of a the integrity'of the seal.

. performed by applying the compositions to the form a smooth uniform mixture. The heating temperature should not exceed 115 degrees C., in order to obtain a yellowish-brown color of product. If this temperature is exceeded to any substantial extent, the color darkens rapidly and decomposition of the stearate may occur: 'the thorough preliminary mixture also assists in preventing decomposition. The heated and blended product may be permitted to cool naturally, but preferably its cooling is accelerated to avoid maintaining the material at an elevated temperature for an excessive length of time.

The product neverhardens or sets inbulk or in place, and permits easy separation even at low temperatures. I

On exposure to an accelerated dry-out or aging test at a temperature of 70 to 75 degrees C. for 15 hours, compositions of the described type exhibited'properties indicating that they maintain Antiseize tests were first two threads'of a -inch anodized aluminum alloy pipe plug, then screwing the plug into a /2-inch aluminum alloy pipe coupling by use of,

a wrench with a 12-inch lever arm and a torque of. approximately 600 to 900 inch pounds. Each plug was then backed oil about one turn, and the degree of seizure determined by alternately tightening and loosening the plug through a quarter turn as rapidly as possible for about 4 or 5 seconds. If seizure has occurred, the, plug cannot then be removed from the coupling without tearing the threads. On these tests the several compositions were found to give acceptable results.

It is obvious that the-invention is not limited I to the specific examples of practice set out, but

that it may be modified in many ways within the scope of the appended claims.

What is claimed is:

. 1. An anti-seize paste composition for sealing metal joints exposed to the action of gasoline,

comprising 4% to 6 parts by weight of polymer ized blown castor oil substantially insoluble in gasoline, 1 to 2 parts of a soap selected from the group consisting of zinc and calcium soaps of saturated aliphatic acids having at least 17 carbon atoms exclusive of the carboxyl group, and

0.3 to 1.5 parts'of a substantially neutral alkyl ester of ricinoleic acid with a saturated aliphatic alcohol having up to 6 carbon atoms.

2. An anti-seize paste composition for sealing.

metal joints exposed to the action of gasoline, comprising 4 /2 to 6 parts by weight of polymerized blown castor oil substantially insoluble in gasoline, 1 to 2 parts of zinc stearate, and 0.3 to 1.5 parts of a substantially neutral alkyl ester of ricinoleic acid with a saturated aliphatic alcohol having up to 6 carbon atoms.

3. An anti-seize paste composition for sealingi -metal joints-exposed to the action of gasoline.

consisting-of a mixture of highly polymerized blown castor oils, one of said castor oils being high blown and polymerized into a thick viscous mass and substantially 4 parts by weight thereof employed, and another of said castor oils being less highly blown and polymerized and substan-- tially /2 to -2V parts thereof employed and form'- ing in mixture with the said one castor oil a less viscous vehicle, 1 to 2 parts of a soap selected from the group consisting of zinc and calcium soaps of saturated aliphatic acids having at least 17 carbon atoms exclusive of the carboxyl'group, and 0.3 to 1.5 parts of a substantially neutral alkyl ester of ricinoleic acid with a saturated aliphatic alcohol having up to 6 carbon atoms.

4. An anti-seize paste composition for sealing metal Joints exposed to the action of gasoline, comprising 4% to 6 parts by weight of polymerized blown castor oil substantially insoluble in' gasoline, 1 part of zinc, stearate, and about 0.6 parts of a substantially neutral alkyl ester of ricinoleic acid with a saturated aliphatic alcohol having up to 6 carbon atoms.

M. PARKER.

'Executrix' of the Estate of Arthur L. Parker, De-

ceased. 

